Listen do the lid mod & cool air injection only, secondaries butterflies, K&n filter pcIII, Just make sure you have it mapped by a professional and you want complain :thumbsup::thumbsup::thumbsup:i have a 04 also . i did install a MUZZY full system without the air box mod. if i wanted more power i would get a PC and do the air box mod. my bike runs so sweet i do not want to F with a good thing. you know merfeys law.